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Spare the rod and spoil the eye
G B Arden1, R L Sidman, W Arap
1Henry Wellcome Laboratories, Applied Vision Research Centre, Department of Optometry and Visual Science, City University, Northampton Square, London EC1V 0HB, UK. g.arden@city.ac.uk
The British Journal of Ophthalmology
|June 1, 2005
Summary
This review proposes that rod-driven hypoxia during dark adaptation contributes to sight-threatening retinal diseases like diabetic retinopathy and age-related macular degeneration. This unified view may lead to simpler, safer treatments.
Area of Science:
- Ophthalmology
- Pathogenesis of Retinal Diseases
- Vascular Biology
Background:
- Diabetic retinopathy, age-related macular degeneration, and retinopathy of prematurity are leading causes of acquired retinal degenerative disease.
- Angiogenesis, driven by vascular endothelial growth factor (VEGF) and oxygen levels, plays a key role in the pathology of these conditions.
Purpose of the Study:
- To present a unified view of the pathogenesis of three common acquired retinal degenerative diseases.
- To propose rod-driven hypoxia as a significant contributing factor to the pathogenesis of these eye conditions.
Main Methods:
- Review of experimental reports and existing literature on retinal degenerative diseases.
- Analysis of the role of angiogenesis, VEGF, and oxygen regulation in ocular pathology.
- Formulation of a hypothesis integrating rod-driven hypoxia into disease pathogenesis.
Main Results:
- A unified pathogenic mechanism for diabetic retinopathy, age-related macular degeneration, and retinopathy of prematurity is proposed.
- Rod-driven hypoxia, occurring during normal dark adaptation, is identified as a crucial factor in the development of severe pathological manifestations.
- This hypoxia, peculiar to the eye, complements existing theories on VEGF regulation and angiogenesis.
Conclusions:
- Rod-driven hypoxia offers an elegant explanation for the pathogenesis of these sight-threatening retinal diseases.
- The proposed hypothesis is testable and suggests novel, potentially simpler, and safer therapeutic and preventive strategies.
- Current treatments may be improved by considering the role of rod-driven hypoxia in disease development.
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